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Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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Kim Morrison 8ae39633d1
fix: mark auxiliary definitions from normalizeInstance as meta (#13043) 
This PR fixes a bug where `inferInstanceAs` and the default `deriving`
handler, when used inside a `meta section`, would create auxiliary
definitions (via `normalizeInstance`) that were not marked as `meta`.
This caused the compiler to reject the parent `meta` definition with:

```
Invalid `meta` definition `instEmptyCollectionNamePrefixRel`, `instEmptyCollectionNamePrefixRel._aux_1` not marked `meta`
```

The fix adds an `isMeta` parameter to `normalizeInstance` that is
propagated from the elaboration context (`isMarkedMeta` for
`inferInstanceAs`, `Scope.isMeta` for the deriving handler), and marks
each auxiliary definition created by `mkAuxDefinition` as `meta` when
appropriate.

Found while adapting Mathlib to
https://github.com/leanprover/lean4/pull/12897.

🤖 Prepared with Claude Code

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-22 22:41:57 +00:00
.claude chore: speed up test suite slightly (#12969) 2026-03-20 12:24:32 +00:00
.github fix: nightly dispatch creates today's tag when retrying a failed nightly (#13035) 2026-03-22 11:30:36 +00:00
.vscode chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
doc feat: unfold and rewrap instances in inferInstanceAs and deriving 2026-03-22 13:25:46 +01:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: use null-safe while-read loop for subverso manifest sync (#12928) 2026-03-16 08:17:32 +00:00
src fix: mark auxiliary definitions from normalizeInstance as meta (#13043) 2026-03-22 22:41:57 +00:00
stage0 chore: update stage0 2026-03-22 13:25:46 +01:00
tests fix: mark auxiliary definitions from normalizeInstance as meta (#13043) 2026-03-22 22:41:57 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
.gitpod.Dockerfile chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.gitpod.yml chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.ignore
CMakeLists.txt chore: make leantar available in stage0 (#12992) 2026-03-19 20:43:43 +00:00
CMakePresets.json chore: fix ci for new test suite (#12704) 2026-02-27 23:25:37 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md chore: migrate pkg tests (#12889) 2026-03-11 18:55:46 +00:00
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: add aarch64-darwin to flake (#12915) 2026-03-18 15:55:34 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
LICENSE
LICENSES feat: bundle leantar with Lean (#12822) 2026-03-09 20:10:59 +00:00
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.